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I have developed some times ago easy to use .NET MT4 API and can sell it. Also could provide trial version.

API shows tooltips to all functions:

ToolTip

C# example:

using System;
using System.Collections.Generic;
using System.Text;
using MetaTraderApi;

namespace TestClient
{
	public class ExtendedMT : MetaTrader
	{
		public ExtendedMT(string channelName)
			: base(channelName)
		{
		}

		public int buy(string symbol)
		{
			double ask = MarketInfo(symbol, InfoMode.ASK);
			int ticket = OrderSend(symbol, Op.BUY, 1, ask, 0, 0, 0);
			if(ticket<=0)
				throw new Exception(GetLastErrorDescription());
			return ticket;
		}

		public int sell(string symbol)
		{
			double bid = MarketInfo(symbol, InfoMode.BID );
			int ticket = OrderSend(symbol, Op.SELL, 1, bid, 0, 0, 0);
			if (ticket <= 0)
				throw new Exception(GetLastErrorDescription());
			return ticket;
		}

		public void closeAll()
		{
			while (OrdersTotal()>0)
			{
				if(OrderSelect(0, SelectMode.BY_POS))
				{
					double price = 0;
					if(OrderType() == Op.BUY )
						price = MarketInfo(OrderSymbol(), InfoMode.BID);
					if(OrderType() == Op.SELL)
						price = MarketInfo(OrderSymbol(), InfoMode.ASK);
					if(!OrderClose(OrderTicket(), OrderLots(), price,0))
						throw new Exception(GetLastErrorDescription());
				}
				else
					throw new Exception(GetLastErrorDescription());
			}
		}

		public void printOrders()
		{
			int count = OrdersTotal();
			for (int i = 0; i < count; i++)
			{
				if (OrderSelect(i, SelectMode.BY_POS))
					Console.WriteLine(OrderSymbol() + " " + OrderExpiration());
				else
					throw new Exception(GetLastErrorDescription());
			}
		}

		public int buyPending(string symbol)
		{
			double ask = MarketInfo(symbol, InfoMode.ASK);
			double point = MarketInfo(symbol, InfoMode.POINT);
			double price = ask + 10 * point;
			int ticket = OrderSend(symbol, Op.BUYSTOP, 1, price, 0, 0, 0, 
				null, 0, DateTime.Now.AddHours(1));
			if (ticket <= 0)
				throw new Exception(GetLastErrorDescription());
			return ticket;
		}
	}
}

Regards

Tim

timurila@gmail.com

Trial version of Reduced .NET MT4 API attached. This version called reduced because it doesn't support back testing, just real time trading. It allows communicating with MT4 from .NET executable. Later would be presented Complete .NET MT4 API (as separate product) that allows to create EA in .NET DLL and back testing would be available as well as real time trading. Tool tips and debugging in Visual Studio available in Reduced .NET MT4 API.

Regards

Tim

New 1.0.3 version of MT4 .NET API avaliable.

Fixed problem with tooltips.

Previuosly were realized just trading and checkup functions. From now account functions also available.

Tim

www.tradingapi.net

If you want to use in MT EA data from another MT platform this API it's just the part of solution. I could make the second part for you also.

Tim

www.tradingapi.net

If you know SQL I also can propose MT4 MSSQL API that allows to work with MSSQL database from MQL. In this case you could make exchange between platforms via DB.

Tim

www.tradingapi.net